mirror of https://github.com/schollz/croc.git
129 lines
3.5 KiB
Go
129 lines
3.5 KiB
Go
package crypt
|
|
|
|
import (
|
|
"crypto/cipher"
|
|
"crypto/rand"
|
|
"crypto/sha256"
|
|
"fmt"
|
|
"log"
|
|
|
|
"golang.org/x/crypto/argon2"
|
|
"golang.org/x/crypto/chacha20poly1305"
|
|
"golang.org/x/crypto/pbkdf2"
|
|
)
|
|
|
|
// New generates a new key based on a passphrase and salt
|
|
func New(passphrase []byte, usersalt []byte) (key []byte, salt []byte, err error) {
|
|
if len(passphrase) < 1 {
|
|
err = fmt.Errorf("need more than that for passphrase")
|
|
return
|
|
}
|
|
if usersalt == nil {
|
|
salt = make([]byte, 8)
|
|
// http://www.ietf.org/rfc/rfc2898.txt
|
|
// Salt.
|
|
if _, err := rand.Read(salt); err != nil {
|
|
log.Fatalf("can't get random salt: %v", err)
|
|
}
|
|
} else {
|
|
salt = usersalt
|
|
}
|
|
key = pbkdf2.Key(passphrase, salt, 100, 32, sha256.New)
|
|
return
|
|
}
|
|
|
|
// Encrypt will encrypt using the pre-generated key
|
|
func Encrypt(plaintext []byte, key []byte) (encrypted []byte, err error) {
|
|
encrypted = plaintext
|
|
return
|
|
// // generate a random iv each time
|
|
// // http://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38d.pdf
|
|
// // Section 8.2
|
|
// ivBytes := make([]byte, 12)
|
|
// if _, err = rand.Read(ivBytes); err != nil {
|
|
// log.Fatalf("can't initialize crypto: %v", err)
|
|
// }
|
|
// b, err := aes.NewCipher(key)
|
|
// if err != nil {
|
|
// return
|
|
// }
|
|
// aesgcm, err := cipher.NewGCM(b)
|
|
// if err != nil {
|
|
// return
|
|
// }
|
|
// encrypted = aesgcm.Seal(nil, ivBytes, plaintext, nil)
|
|
// encrypted = append(ivBytes, encrypted...)
|
|
// return
|
|
}
|
|
|
|
// Decrypt using the pre-generated key
|
|
func Decrypt(encrypted []byte, key []byte) (plaintext []byte, err error) {
|
|
plaintext = encrypted
|
|
return
|
|
// if len(encrypted) < 13 {
|
|
// err = fmt.Errorf("incorrect passphrase")
|
|
// return
|
|
// }
|
|
// b, err := aes.NewCipher(key)
|
|
// if err != nil {
|
|
// return
|
|
// }
|
|
// aesgcm, err := cipher.NewGCM(b)
|
|
// if err != nil {
|
|
// return
|
|
// }
|
|
// plaintext, err = aesgcm.Open(nil, encrypted[:12], encrypted[12:], nil)
|
|
// return
|
|
}
|
|
|
|
// NewArgon2 generates a new key based on a passphrase and salt
|
|
// using argon2
|
|
// https://pkg.go.dev/golang.org/x/crypto/argon2
|
|
func NewArgon2(passphrase []byte, usersalt []byte) (aead cipher.AEAD, salt []byte, err error) {
|
|
if len(passphrase) < 1 {
|
|
err = fmt.Errorf("need more than that for passphrase")
|
|
return
|
|
}
|
|
if usersalt == nil {
|
|
salt = make([]byte, 8)
|
|
// http://www.ietf.org/rfc/rfc2898.txt
|
|
// Salt.
|
|
if _, err = rand.Read(salt); err != nil {
|
|
log.Fatalf("can't get random salt: %v", err)
|
|
}
|
|
} else {
|
|
salt = usersalt
|
|
}
|
|
aead, err = chacha20poly1305.NewX(argon2.IDKey(passphrase, salt, 1, 64*1024, 4, 32))
|
|
return
|
|
}
|
|
|
|
// EncryptChaCha will encrypt ChaCha20-Poly1305 using the pre-generated key
|
|
// https://pkg.go.dev/golang.org/x/crypto/chacha20poly1305
|
|
func EncryptChaCha(plaintext []byte, aead cipher.AEAD) (encrypted []byte, err error) {
|
|
nonce := make([]byte, aead.NonceSize(), aead.NonceSize()+len(plaintext)+aead.Overhead())
|
|
if _, err := rand.Read(nonce); err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
// Encrypt the message and append the ciphertext to the nonce.
|
|
encrypted = aead.Seal(nonce, nonce, plaintext, nil)
|
|
return
|
|
}
|
|
|
|
// DecryptChaCha will encrypt ChaCha20-Poly1305 using the pre-generated key
|
|
// https://pkg.go.dev/golang.org/x/crypto/chacha20poly1305
|
|
func DecryptChaCha(encryptedMsg []byte, aead cipher.AEAD) (encrypted []byte, err error) {
|
|
if len(encryptedMsg) < aead.NonceSize() {
|
|
err = fmt.Errorf("ciphertext too short")
|
|
return
|
|
}
|
|
|
|
// Split nonce and ciphertext.
|
|
nonce, ciphertext := encryptedMsg[:aead.NonceSize()], encryptedMsg[aead.NonceSize():]
|
|
|
|
// Decrypt the message and check it wasn't tampered with.
|
|
encrypted, err = aead.Open(nil, nonce, ciphertext, nil)
|
|
return
|
|
}
|